RCTrms
Thin, flexible, clip-around, AC current sensor with true rms output
The RCTrms has an industry standard 4-20mA output making it ideal for process control, status alarming or system monitoring purposes.




Product Synopsis
RCTrms
Thin, flexible, clip-around, ac current probe with true rms output
The RCTrms is an AC current sensor for permanent installation.
The RCTrms has an industry-standard 4-20mA output making it ideal for process control, status alarms or system monitoring purposes.
Simple to install and easy to retrofit, the Rogowski (sense) coil is thin, lightweight, flexible, and clip-around. The electronic enclosure houses the integrator and signal conditioner to provide an accurate, true rms measurement of the AC current.
RCTrms current probes offer:
- Measure AC current only
- Single channel
- 100Arms to 50kArms
- 4-20mA True RMS output
- Abs. Maximum peak di/dt: 3.0kA/µs
- Abs. Maximum rms di/dt: 0.24kA/µs
The RCTrms is typically used with SCADA systems, PLCs, data loggers and protection equipment.
RCTrms Features
- Traceable calibration (certificate included)
- Non-magnetic materials mean excellent linearity <0.2% reading
- Fully isolated measurement
- Isolated power supply 2kVdc
- 2kV peak insulated coil
- Small DIN rail enclosure
Standards and Approvals
- CE marked
- Complies with EMC EN61326-1
- Complies with IEC 61010-1; IEC 61010-2-032
- PEM Ltd is certified to the ISO9001:2015 standard
PEM are committed to delivering the highest level of quality to our customers, read more about how we strive to achieve this in our Quality Standards and Compliance sections.
Key Features
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Easy to retro-fit
Lightweight, thin, flexible, clip-around coil for permanent installation.
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Simple to install
Exceptionally easy to install and retro-fit into existing plant.
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Optimal for limited space
Ideal for applications with limited space for installation and particularly where existing monitoring equipment is installed.
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Control and monitoring
Ideal for process control, status alarming or system monitoring in a wide variety of applications, from arc furnaces to power distribution.
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Non-intrusive
The device draws no power from the primary circuit.
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Intrinsically safe
No danger of open circuit secondaries.
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Custom cable length
Longer cables than the standard 1m and 2.5m are available on request.
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Custom coil length
Coil lengths longer than the standard 300mm, 500mm, 700mm and 1000mm are available on request.
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Bespoke options
Choose from a range of standard options or create a custom design.
Performance
Technical Specifications
All models
- Rated current (rms)
- 100A, 250A, 500A, 800A, 1000A, 1600A, 2000A, 2500A, 3000A, 4000A, 5000A, 8000A, 10000A, 16000A, 20000A, 25000A, 30000A, 40000A, 50000A
- Rated output (Full scale FS)
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4 to 20mA
- Output limit
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150% FS (28mA peak)
- Supply voltage (Wide input)
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12Vdc (-10%) to 24Vdc (+20%) Max.
- Input power
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0.7W
- Operating temperature range
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–5°C to +65°C (Integrator electronics)
–20°C to +80°C (Coil and cable) - Bandwidth(-3dB)
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2Hz to 100kHz
- Response time (10-90%)
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1000ms
- Accuracy (typ.)
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±1.5% of reading
(10% to 150% FS, 25°C) - Output load
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<300Ω
- Coil length
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300mm, 500mm, 700mm or 1000mm
(Longer coils are available on request). - Cable length
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1m or 2.5m
(Longer cables are available on request).
Dimensions
What is included?
We also offer a range of additional options for each RCT product. Choose from coil and cable lengths, IP65 enclosures, IPX8 Coils and BNC Splitters.
- CE marked
- Complies with EMC EN61326-1
- Complies with IEC 61010-1; IEC 61010-2-032
- PEM Ltd is certified to the ISO9001:2015 standard
PEM are committed to delivering the highest level of quality to our customers, read more about how we strive to achieve this in our Quality Standards and Compliance sections.
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Rogowski Coil
A thin, flexible, lightweight, clip-around (sensing) coil.
(Custom Sizes Available) -
A Connecting Cable
A cable to connect the Rogowski coil to the electronics. (BNC Option Shown).
(Custom cable lengths available on request) -
Din Rail Mount Enclosure
Integrator and signal conditioning electronics housed on a DIN rail mounting enclosure.
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Calibration Certificate
Every unit is supplied with a fully traceable calibration certificate.




Customise & Options
If your requirement is outside that listed on our website please contact us to discuss your requirements and application.
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Longer Coils
Longer Rogowski coils are available up to 5000mm.
(Custom lengths available on request) -
Longer Cables
Longer cables are available up to 50m.
(Custom lengths available on request) -
BNC Cable Split
Isolated BNC to BNC cable split option. BNC to BNC disconnect to allow easy installation of RCT. Plastic touch proof connection for safety.
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IPX8 Rated Rogowski Coil
Weather proofed coil and cable. A flexible current probe based on Rogowski principle, suitable for measurement in combination with portable devices.
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Aluminium IP65 enclosure
An aluminium IP65 die-cast panel enclosure (with improved EMC rejection).
Previously known as IRF.
Get a Quote
Build your RCT product options and complete our online quotation form.
Custom Design
We can provide custom designs for one off applications or volume manufacture.
Downloads
For more information and documents please see our full technical resources area.
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Datasheets
RCTrms Datasheet PDF 1.2MB Updated: 3rd October, 2023
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Instruction Sheets
RCTrms / RCTrms-3ph Instruction Manual PDF 2.1MB Updated: 9th October, 2023
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Dimension Drawings
RCTi / RCTrms Dimensions PDF 203KB Updated: 3rd May, 2024
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Dimension Drawings
RCTi / RCTrms Dimensions (IRF Option) PDF 210KB Updated: 3rd May, 2024
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Dimension Drawings
RCTi / RCTrms Dimensions (BNC Option) PDF 212KB Updated: 3rd May, 2024
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CAD Files
IP65 Aluminium Enclosure STP 2.0MB Updated: 19th December, 2023
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CAD Files
RCTi / RCTrms Enclosure STP 3.6MB Updated: 19th December, 2023
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CAD Files
RCT Coil STEP 3.2MB Updated: 20th October, 2023
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Technical Notes
RCTrms / RCTrms-3ph Technical Notes PDF 2.5MB Updated: 9th October, 2023
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Compliance
RCT Warranty PDF 197KB Updated: 9th January, 2025
Technical Resources
Browse our extensive resources of technical information, insights and test data.
Get a Quote
Build your RCT product options and complete our online quotation form.
Applications
For more information on possible and suitable applications please review the applications below and click each one for further information.
Quality Standards
We are committed to delivering the highest standards of excellence to customers.
Compliance
We prioritise compliance with industry standards ensuring all products are safe.